Question

Is 5x+6y=1 a direct variation? (yes or no only)

Is -4x+9y=4 a direct variation? (yes or no only)

Answer 1

direct variation is y=kx
indirect variation is y=k/x

if we can get it into that form, then it is

5x+6x=1
6y=-5x+1
y=(-5/6)x+1/6
yes


-4x+9y=4
9y=4x+4
y=(4/9)x+4/8
yes